linux-kernel - Re: scheduler nice 19 versus 'idle' behavior / static low-priority scheduling

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Date:	Fri, 30 Jan 2009 14:56:37 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Nathanael Hoyle <nhoyle@...letech.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: scheduler nice 19 versus 'idle' behavior / static low-priority
 scheduling


On Friday 2009-01-30 09:16, Nathanael Hoyle wrote:
><snipped old version, because of a fixed goof, and this has better
>formatting for mail client>
>
>extern char **environ;
>[...]
>  if(argc==2) {
>    if(execve(argv[1], NULL, environ) == -1) {
>      perror("Failed to execve target!");
>    }
>  } else {
>    if(execve(argv[1], argv+1, environ) == -1) {
>      perror("Failed to execve target!");
>    }
>  }

Are you sure your first execve even works? I would have used

   if (execvp(argv[1], &argv[1]) < 0)
	...

just so (a) I do not have to deal with the ugly 'extern char **environ'
[such should have been in a libc header imho] or use
int main(int argc, char **argv, char **envp); (b) execvp so that
it looks through $PATH, just as /bin/su (resp. the shell it starts) would do.
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